PCF8591 module AD / DA conversion module / digital-analog conversion module temperature illumination acquisition
The PCF8591 is a monolithic integrated, powered, low power, 8-bit CMOS data acquisition device. The PCF8591 has four analog inputs, one analog output and one serial I2C bus interface. The three address pins A0, A1 and A2 of the PCF8591 can be used for hardware address programming, allowing access to eight PCF8591 devices on the same I2C bus without additional hardware. In the PCF8591 device input and output address, control and data signals are through the two-wire bi-directional I2C bus to serial transmission.
PCF8591 main performance indicators:
single power supply
PCF8591 operating voltage range of 2.5V-6V
low standby current
through the I2C bus serial input / output
PCF8591 is addressed via 3 hardware address pins
PCF8591 sampling rate determined by the I2C bus rate
4 analog inputs can be programmed as single-ended or differential inputs
Automatic incremental channel selection
PCF8591 analog voltage range from VSS to VDD
PCF8591 built-in tracking and maintaining circuit
8-bit successive approximation of A / D converter
DAC gain through 1 analog output
Two baby description
1 module chip using PCF8951
2 module supports external 4-way voltage input acquisition (voltage input range 0-5v)
3 module integrated photoresistor, can be collected by AD ambient light intensity accurate value
4 module integrated thermistor, you can collect the ambient temperature through AD accurate value
5 module integrated 1 0-5V voltage input acquisition (through the blue potentiometer to adjust the input voltage)
6 module with power indicator (light on module power indicator)
7 module with DA output indicator, when the module DA output interface voltage reaches a certain value, will illuminate the board DA output indicator, the greater the voltage, the more obvious the brightness of the light;
8 module PCB size: 3.6cm * 2.3cm
9 standard double-sided, thick plate 1.6mm, beautiful layout, surrounded by through-hole, aperture: 3mm, easy to fix
Three module interface description
The left and right sides of the module, respectively, outside the expansion of two rows of pin contacts, respectively, as follows:
Left AOUT chip DA output interface
AINO chip analog input interface 0
AIN1 chip analog input interface 1
AIN2 chip analog input interface 2
AIN3 chip analog input interface 3
The right side of the SCL IIC clock interface to the microcontroller IO port
SDA IIC digital interface to the microcontroller IO port
GND module grounded
VCC power interface external 3.3v-5v
Four module red short-circuited hat instructions
The module has three red short-circuit caps, respectively, as follows:
P4 connected to the P4 short-circuit cap, select the thermistor access circuit
P5 connected to the P5 short-circuit cap, select the photosensitive resistor access circuit
P6 connected to the P6 short-circuit cap, select 0-5V adjustable voltage access circuit